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Solved: Correct setup of DIR-615 router configuration for RDC


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eddie32818's Avatar
eddie32818 eddie32818 is offline
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05-Nov-2009, 04:04 PM #1
Solved: Correct setup of DIR-615 router configuration for RDC
I apologize if I posted this in the wrong section.

I have been trying to achieve a Remote Desktop Connection with my office PC (Host -- Win XP Pro service pack 3) with my wireless laptop (Client -- Win XP Home) at my house.

The RDC works at my office in the LAN, when I have my laptop connected in the office network. However, from my home's LAN, I cannot access the Host over the Internet (WAN).

I have tried to open port 3389 for the RDC in the PortForwarding section on my Office's D-Link DIR-615 router setup and did the same for my home's belkin 54G router at home, under Virtual Server, in that setup.

Has anyone had this type of problem with Microsoft Remote Desktop?
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05-Nov-2009, 05:12 PM #2
The port only has to be opened at the receiving end, nothing needs to be done to the connecting computer's router.

That's all that you should have to do, are you SURE you have the right IP address for the office LAN?
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05-Nov-2009, 09:57 PM #3
Thanks for pointing that out to me.

I used whatismyip.com and got the correct "external" ip -- was this I hope, correct?

I really don't see how this interferred with the connection, having the port open at the client end as well as open at the Host PC. Does it cause the port to get locked (in the client -- at my houset)?

I appreciate your help, especially since I have been reading many tutorials on this since last week (I have tried looking at this from many different perspectives I am optimistic I will arrive at a solution, hopefully soon)
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06-Nov-2009, 09:56 AM #4
Well, that port didn't interfere, it just wasn't necessary.

Don't know what is going on there, can you ping the external IP at the remote site? The site you mention will only get you an IP address at your local site, not the remote site. One way of mapping the remote site IP address is using DynDNS and running their client on the remote site. This will give you a static URL that will always map to their dynamic IP address.
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06-Nov-2009, 03:42 PM #5
Hello JohnWill,

Thanks for taking the time to help me. I tried pinging the Host (or office PC) from the Client PC (or Remote PC -- my home) several times, but they all timed out.

I ran whatismyip.com on my Host machine and at my Client machine, just to see the if the thing was working. (I also thought that info is verified by accessing the Routers at both locations -- as I could see it matched.)

Please correct me if I am wrong, but I thought sites such as DYNDns where used to convert the external IP into a "name" and would automatically take into account any changes in the external IP to facilitate an "easy" connection with the "name" chosen in their client software. (thus eliminating the need to run whatismyip every so often to see if the external IP has changed)

One other thing I forgot to add -- at the office, I made a "static IP" for the Host PC through the DIR-615 router setup. The office PC connects fine to Internet and LAN, but the Remote (my home) PC cannot access it. I also unistalled NIS2009 (will get it reinstalled after I finish troubleshooting) on both the Client and Host PC's Both are using Windows firewall and both have RDC enabled.

Unfortunately, I have also gotten the same results when I tried using Remote Desktop Web Connection (RDWC), as well, which was installed in my Office PC (Host). Again the Cilent (my laptop) can connect to the Host in the LAN at the Office, but not from the same Remote PC (Client/my laptop) over the Internet from my home. I needed to point out that the successful connections in the office LAN are achieved by using the assigned (local -- 192.168.x.xx) IP or by the computer name, and not the external IP (assigned by ISP) that I obtained from the Router's setup menu.

It seems RDC or RDWC only works in LAN. Am I not understanding something?
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06-Nov-2009, 03:56 PM #6
The inability to ping the office router from home may be because WAN Ping (see p. 34 of DIR-615 manual) is set to block those pings. Or maybe you are using the wrong public IP address, but from what you describe you seem to have that well under control.

What exactly is happening when you try RDC from home--what error message?

Maybe show us a screen shot of the Port Forwarding on the DIR-615?

Uh, one other thing. Exactly what brand and model is the office modem? Sometimes the modem turns out to be a modem/router combo, which needs port forwarding.
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06-Nov-2009, 04:54 PM #7
Quote:
Originally Posted by TerryNet View Post
The inability to ping the office router from home may be because WAN Ping (see p. 34 of DIR-615 manual) is set to block those pings. Or maybe you are using the wrong public IP address, but from what you describe you seem to have that well under control..
I don't have the manual handy -- I will try to find a PDF version at Dlink site and check if WAN ping is enabled.


Quote:
Originally Posted by TerryNet View Post
What exactly is happening when you try RDC from home--what error message?
I get the error message at my laptop with Remote Desktop Connection (at home):

This computer can't connect to the remote computer. Try connecting again. If the problem continues, contact the owner of the remote computer or your network administrator."

I get the error message at my laptop with Remote Desktop Web Connection (at home):

"Internet Explorer cannot display the webpage...."

Quote:
Originally Posted by TerryNet View Post
Maybe show us a screen shot of the Port Forwarding on the DIR-615?
It looks like this from PortForwarding.com site:

http://portforward.com/english/route...te_Desktop.htm

I have the IP entered correctly for the office PC, in the correct field (blank in the screenshot).

Quote:
Originally Posted by TerryNet View Post
Uh, one other thing. Exactly what brand and model is the office modem? Sometimes the modem turns out to be a modem/router combo, which needs port forwarding.
Now that you bring this up, I wonder if the DSL modem is in Bridged-mode or not. I am not at the office and I don't remember the model of the DSL modem.

The office network used to be like this:

Internet --> DSL modem --> 24-port switch --> 20 office PC's
--> Dir-615 wireless router (running off 24-port switch)


Then when I wanted to make a static IP for my office PC with the DIR-615, so I did this:

Internet --> Dir-615 wireless router --> DSL modem --> 24-port switch --> 20 office PC's

I think I might have jumped the gun, here...

Please tell me if I should put it back the way the network was, so that I can try to telnet into the DSL modem/reouter/combo (I have not done this in a very long time - don't remember the login info) and if I should try to enable portforwarding and WAN ping from the modem/router/combo.

Or if I should put the modem/router/combo in Bridged-Mode and keep the DIR-615 direclty connected to it. (I have a feeling you are right, that the DSL modem might already be in Router-Mode and not in Bridged-Mode.)

Last edited by eddie32818; 06-Nov-2009 at 05:01 PM..
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06-Nov-2009, 05:17 PM #8
Quote:
Internet --> DSL modem --> 24-port switch --> 20 office PC's
This implies that "Internet" is a phone cable; and either the DSL modem is a modem/router combo or else you are getting at least 20 public IPs from your ISP.

Quote:
Internet --> Dir-615 wireless router --> DSL modem --> 24-port switch --> 20 office PC's
This implies that "Internet" is an ethernet cable coming from a modem; and that the DSL modem is a modem/router combo configured and used as a switch.

I'm sorry, but I don't understand your network enough to make any suggestions at this time. Until now I (and John, I'm sure) assumed that you had

Simple DSL or cable modem -> DIR-615 router -> computers (possibly with additional switch).
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06-Nov-2009, 05:55 PM #9
Well, you can't connect through that DIR-615 then through the DSL "modem", which I'm almost sure it a modem/router easily. You have two NAT layers. Are you connecting wirelessly to the computer you want to remote desktop into?

What's the exact make/model of that DSL "modem"?

Can you supply a network diagram of how all this connects and where the machine you want to connect to is logically?
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06-Nov-2009, 05:56 PM #10
TerryNet,

I am sorry that I was not clear. When I mentioned "Internet" in the office layouts, I acutally meant an Internet Connection with the outside world, coming into the building from our ISP via telephone line. Also, I apologize for making an error in the altered layout. In both layouts, the DSL modem is First.


Original office network layout:

Internet (from ISP via telephone line) --> DSL modem --> 24-port switch --> 20 office PC's
--> Dir-615 wireless router (running off 24-port switch)


Altered office network layout (corrected my mistake):

Internet (from ISP via telephone line) --> DSL modem --> Dir-615 wireless router --> 24-port switch --> 20 office PC's

Sorry about that mixup.
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06-Nov-2009, 06:02 PM #11
What is the EXACT make and model of the DSL modem? I'm suspecting this is the problem, we just need some details.
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06-Nov-2009, 06:53 PM #12
Quote:
In both layouts, the DSL modem is First.
Glad of that; I was really confused!

We'll await your DSL modem info on your next visit to the office.
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06-Nov-2009, 06:53 PM #13
QUOTE:
Well, you can't connect through that DIR-615 then through the DSL "modem", which I'm almost sure it a modem/router easily. You have two NAT layers. Are you connecting wirelessly to the computer you want to remote desktop into?

What's the exact make/model of that DSL "modem"?

Can you supply a network diagram of how all this connects and where the machine you want to connect to is logically?
[QUOTE/]

Yes, I was trying to use my laptop on home's wireless network to access the Host PC at the office (Host PC is not connected wirelessly -- but connected throught ethernet (LAN).)

I will post back when I get a chance to go to the office and check the make/model of the modem. I think it was an Zxyel something (very small package - 4x4x2), issued by Embarq.

As for the question relating to Diagram of office network:

Original office network layout:

Internet (from ISP via telephone line) --> DSL modem --> 24-port switch --> 20 office PC's
--> Dir-615 wireless router (running off 24-port switch)


Altered office network layout (corrected my mistake from original post):

Internet (from ISP via telephone line) --> DSL modem --> Dir-615 wireless router --> 24-port switch --> 20 office PC's
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07-Nov-2009, 09:59 AM #14
Good morning Terry, John,

The DSL modem in the office is an EQ-660R ADSL Router by Embarq. (I thought it was a ZyXel)

I am wondering if it will be easier to revert back to placing the wireless router (DIR-615) back to the original office network layout (attached to the 24-port switch) and configure it for WAP. It is probably better this way -- so that we could have minimal signal interferrence because we could easily locate an ethernet jack to plug it in anywhere in the building for optimal performance of the wireless router. (right now all of the office network devices are in an "Electric Room" located at the far side of the building.

If I revert back to the original network layout, then would it just be just the matter of enabling of Port Forwarding on the EQ-660R and leave it functioning in "Router-mode" and at the same time, this would also eliminate the Double NAT conflict, that exists in my altered office network layout?

I look forward to your advice.

Eddie
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07-Nov-2009, 10:12 AM #15
Yes, yes, and yes. Using the D-Link as wireless access point only and the Embarq as the only router is probably your best bet. Hopefully the port forwarding on that will go smoothly and you will soon report access from home.
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